<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <el-form :model="addForm"
               :rules="addFormRules" 
               ref="addFormRef" 
               label-width="100px"
               label-position="top">

              <!-- 左侧tab栏区域 -->
        <el-tabs v-model="activeIndex" 
                 :tab-position="'left'"
                 :before-leave="beforeTabLeave"
                 @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <!-- 级联选择器选择项 -->
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="{ expandTrigger: 'hover',...cateProps }"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border>{{cb}}</el-checkbox>
                </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片上传的后台API地址 -->
            <el-upload
              action='http://127.0.0.1:8888/api/private/v1/upload'
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>

    </el-card>

    <!-- 图片预览对话框 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">

    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex:'0',
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        // 商品所属的分类数组
        goods_cat:[],
        pics:[],
        goods_introduce:'',
        attrs:[]
      },
      addFormRules:{
        goods_name:[
          {
            required:true,
            message:'请输入商品名称',
            trigger:'blur'
          }
        ],
        goods_price:[
          {
            required:true,
            message:'请输入商品价格',
            trigger:'blur'
          }
        ],
        goods_weight:[
          {
            required:true,
            message:'请输入商品重量',
            trigger:'blur'
          }
        ],
        goods_number:[
          {
            required:true,
            message:'请输入商品数量',
            trigger:'blur'
          }
        ],
        goods_cat:[
          {
            required:true,
            message:'请选择商品分类',
            trigger:'blur'
          }
        ]
      },
      // 商品分类列表
      catelist:[],
      cateProps:{
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      manyTableData:[],
      onlyTableData:[],
      // 图片上传的请求头，拿token
      headerObj:{
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath:'',
      previewVisible:false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList(){
      const {data:res} = await this.$http.get('categories')
      this.catelist =res.data
    },
    // 级联选择器选中项变化,会触发的函数
    handleChange(){
      if(this.addForm.goods_cat.length!==3){
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName, oldActiveName){
      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked(){
      // 证明是动态参数面板
      if(this.activeIndex === '1'){
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        { params : {sel:'many'}})

        res.data.forEach (item => {
          item.attr_vals = item.attr_vals.length ===0 ? 
          [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        console.log(this.manyTableData);
      }else if(this.activeIndex === '2'){
         const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        { params : {sel:'only'}})
        this.onlyTableData = res.data
      }
      // 证明是商品属性面板

    },
    // 处理图片预览效果
    handlePreview(file){
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 移除图片的操作
    handleRemove(file){
      const filePath = file.response.data.tmp_path
      const i = this.addForm.pics.findIndex(x => {
        x.pic === filePath
      })
      this.addForm.pics.splice(i,1)
      console.log(this.addForm);
    },
    handleSuccess(response){
      const picInfo ={
        pic : response.data.tmp_path 
      }
      this.addForm.pics.push(picInfo)
    },
    async add(){
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加表单的处理
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = this.addForm.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach( item => {
          const newInfo = {
            attr_id:item.attr_id,
            attr_value:item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id:item.attr_id,
            attr_value:item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })

        form.attrs = this.addForm.attrs
        console.log(form);
        const {data: res} = await this.$http.post('goods', form)
        if(res.meta.status !== 201){
          this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed:{
    cateId(){
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-steps{
  margin: 15px 0;
}
.el-step_title{
  font-size: 13px;
}
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 70%;
}
.btnAdd{
  margin-top: 15px;
}
</style>